Jaw crusher



Feb. 16, 1965 Filed Nov. 30, 1962 W. KOCH JAW CRUSHER 2 Sheets-Sheet 1 lNVENI'O? W/L 1954M K006 Aqz,

W. KOCH JAW CRUSHER Feb. 16, 1965 2 Sheets-Sheet 2 Filed Nov. 30, 1962 FIG. 4

nited S tsPatent 3,169,713 Patented Feb. 16, 1965 3,169,713 JAW CRUSEER Wilhelm Koch, Hambacher Strasse 43, Neustadt an der Weinstrasse, Germany 1 Filed Nov. 30, 1962, Ser. No. 241,240 Claims priority, application Germany, Dec. 2, 1961, K 45,336; Oct. 31, 1962, K 48,093 6 Claims. (Cl. 241-266) The present invention relates to jaw crushers for crushing minerals or the like and more particularly to the type of jaw crushers which have two rocking or oscillating jaws. Jaw crushers of this type have two mutually swinging crushing jaws which are suspended at the top and to which are imparted opposite swinging movements by means of a suitable drive.

Jaw crushers having suspended crusher jaws which swing towards one another are known per se. Aside from the fact that there are inconsequential differences between them, the known double jaw crushers have certain common characteristics as set forth below.

The two jaws, rockers or swinging members are caused to rock or oscillate by two drives or transmissions which are synchronized. Consequently they require two eccentric drives, which it is very difficult to synchronize and which, owing to the rough operation or heavy duty to which such jaw crushers are subjected, are also very prone to break down. Furthermore, in the installation of the movable parts, especially the oscillating jaws or wings, and for establishing dynamic continuity between these two jaws, a rigid crusher frame is necessary which, in order to meet the problems encountered in such operation, must be correspondingly stable and, therefore, of heavy construction.

It is an object of the invention to provide means for simplifying the driving of the crusher jaws and thereby make them cheaper and less susceptible to breakdowns and, above all, to provide for cutting down the size of the crusher frame which conventionally is very stable, bulky and heavy.

Accordingly the invention provides a double jaw crusher having crusher jaws that rock relative to one another, which are suspended at their upper ends for rocking movement towards each other, where the crusher shaft, i.e. the drive shaft for the crusher jaws is journalled in the lower portion of one crusher jaw and which has two eccentric offsets laterally of one crusher jaw, while in the lower portion of the second crusher jaw a transverse member is provided which is connected by way of a tie rod to the crusher shaft in the first crusher jaw that is twice eccentrically offset to transmit half of the eccentric thrust to the second crusher jaw.

In this manner it is accomplished that half of the thrust which is effected through the directly driven crusher jaw, and the opposite second half of the thrust which is effected by the opposite crusher jaw are in exact synchronism. Furthermore, the two crusher jaws may be suspended for pivotal movement from a relatively light frame which in a manner known per so may be supported on a base in any desired manner. The frame need no longer complete the dynamic connection between the two crusher jaws and can therefore be made correspondingly light and also economically.

The crusher shaft in one of the crusher jaws is preferably disposed with its center substantially at the level of the lower end of the crusher jaw.

For changing the width of the crusher gap, interchangeable shims may be provided in a know manner which are disposed upon a draw bar between the second indirectly driven crusher jaw and a transverse member which is associated therewith.

The change of the crusher gap width can also be effected by arrangement of an eccentric axle in the second indirectly driven crusher jaw which is provided with means for changing its eccentricity and for fixing it in a predetermined position.

Further objects and advantageous details of the invention will become apparent from the following specification with reference to the drawings, which illustrate embodiments of the subject of the invention and in which:

FIG. 1 is a section of an embodiment of the jaw crusher in accordance with the invention,

FIG. 2 is a plan view of the jaw crusher in accordance with FIG. 1, partly in section,

FIG. 3 is a longitudinal section of another embodiment of the jaw crusher, and

FIG. 4 is a section taken along the line IVIV of FIG. 3.

Two crusher jaws 2 (2a and 2b) are suspended from a frame 1 for pivotal movement about pins 3. The pins 3 are journalled in bearings 4 which are of generally the same construction.

A crusher shaft 5, which in the embodiment shown has a mid-portion 5 that drives the crusher jaw 2a directly, is not journalled as heretofore in crusher shaft bearings provided in the crusher rack, which now has been replaced by the frame 1, but the mid-portion 5 is journalled at the lower end of the crusher jaw 2a substantially at the level of the lower end of the crusher gap.

For journalling the crusher shaft portion 5" in the crusher jaw 2a, a suitable crusher shaft bearing 6 is provided. At both sides of this bearing 6 the crusher shaft is eccentrically offset. Bearings 7 are provided upon the eccentric offsets 5' which are parts of the tie rods 8, which in turn are connected with each other by means of a transverse member 9 (FIGS. 1, 2) at the lower portion of the oppositely swinging crusher jaw 2b.

Rotation of the crusher shaft 5 causes one-half of the eccentric thrust to be transmitted by way of the eccentric bearings 7 and the tie rods 8 to the transverse member 9 and thence by way of the parts 10, 11 and 12, which will be further described hereinafter, onto the counter crusher jaw 2b. The other half of the thrust is, of course, effected by the crusher jaw 2a. As a result of the simple, exact transmission mechanism which is rather immune to breakdown, the thrusts of the two crusher jaws 2a and 2b which are directed against each other are exactly in synchronism.

Due to the exchangeable shims 10 between the transverse member 9 and the crusher jaw 2b, the gap at the discharge end of the crushing space can be adjusted. Depending on the number or thickness of these exchangeable shims 10, the gap may be set narrower or wider.

A part 11 transmits the thrust movement of the tie rods 8 and thus of the transverse member 9 in a rolling manner onto the breakage guard plate 12.

To insure that during the backward movement of the two crusher jaws 2a and 2b, i.e. during increasing of the lower discharge opening of the crusher gap, the parts 9, 10, 11, 12, and 2b are not lifted from one another, they are in a known manner pressed against each other by a draw bar 13 which has an elastic insert 14.

For supporting the shims 1b and the part 11 a counter plate 15 is provided which is disposed under the transverse member and the other parts. All shims connected with the lower part of the crusher jaw 2b are held in the position illustrated by suspension means 16.

The lateral covering of the crusher space is effected by closure plates 17.

The crusher shaft 5 continues concentrically with respect to the center portion 5" of the crusher shaft after the eccentric offsets 5' for the bearings 7' and the drive fly wheels 18 are received on the parts 5 of the shaft,

which, in turn, areagain concentric with respect to midportion In order to enable the adjustment of the width of the upper portion of the crusher space, shims 19 may be inserted between the suspension bearings 4 and abutments 20 which are associated therewith.

The crusher jaws 2a and 2b are provided in a customary manner in the area of the crusher space with crusher linings 21 which are mounted in fixed position by means of swinging devices 22.

.The drive for the drive wheels 18 and thus for the crusher shaft 5 must be arranged in such a manner that, as indicated in FIG. 1 by means of a dot and dash line, the pulling end of the drive belt extends approximately through the region of the extension of the pivot pin 3 of the driven crusher jaw 2a.

The frame 1 may be supported in any desired manner upon a base, as indicated in dashed lines in FIG. 2. 7

When the jaw crusher is overloaded, the breakage guard plate 12 breaks, and the parts of the plate then fall into the recess of the crusher jaw 2b which is below.

The jaw crusher in accordance with the invention makes it possible to' replace above all the heavy crusher rack that was necessary heretofore and which had to provide dynamic continuity between the two crusher jaws that rock towards one another, by a light suspension frame which may be supported upon a concrete foundation or upon a suitable'steel structure or the like. By eliminating the second crusher drive means which were necessary heretofore in two-jaw crushers, the expense of this drive is saved and also the synchronizing of the two crusher jaw drives which was necessary heretofore and which was not only difiicult to perform but also was subject to frequent breakdown. In accordance with the invention this is obtained in the most simple fashion conceivable by the eccentric bearings described above of the single crusher shaft and by'the stable connection established by these eccentric bearings by way of the tie rods and a transverse member relative to the oppositely disposed and oppositely rocking second crusher jaw which is not directly driven.

The transverse member 9 may advantageously also be replaced by a shaft 23 (FIGS. 3, 4) which is eccentrically jourualled in the crusher jaw 2b.

The adjusting and fixing of the specific eccentric position of this shaft in the crusher jaw 21) may be eifected, for example, byway of a disk 24 (FIG. 3) the periphery of which is provided with teeth at 25. A setting member 26 engages these teeth by means of a lug 27. This setting member may be released or fixed in position by a set screw arrangement 28. a

This simple mechanism eliminates all shims necessary in known arrangements for changing the width of the crusher gap.

Having now described my invention with reference to the embodiments illustrated in the drawings, I do'not wish to be limited thereto, but What I desire to protect by Letters Patent of the United States is set forth in the appended claims.

l. Jaw crusher of the type having two rocking crusher jaws each having an upper end and a lower end, said crusher comprising a support frame supporting said jaws for rocking movement relative to each other, said jaws being-pivotally suspended in pivot bearings at the upper ends thereof from said support frame, a crusher drive shaft having a midportion extending through the lower end of one of said crusher jaws, tie rod means extending between the lower ends of said crusher jaws for operatively connecting said one said crusher jaw with the other said crusher jaw, a transverse member connecting together said tie rod means and the other said crusher jaw, said crusher drive shaft having eccentric oifset means associated with said tie rod means to impart rocking movements to the other said crusher 'jaw and having a concentric outer driven portion.

2. Jaw crusher of the type having two rocking crusher jaws each having an upper end and a lower end, said crusher comprising a support frame supportingsaid jaws for rocking movement relative to each other, said jaws being pivotally suspended in pivot bearings at the upper ends thereof from said support frame, a crusher drive shaft having a mid-portion extending through the lower end of one of said crusher jaws, tie rod means extending between the lower ends of said crusher jaws for operatively connecting said one said crusher jaw with the other said crusher jaw, a transverse member connecting together said tie rod means and the other said crusher jaw, said crusher drive shaft having eccentric offset means'associated with said tie rod means to impart rocking movements to the other said crusher jaw and having a concentric outer driven portion, said crusher jaws defining a gap therebetween and said shaft being disposed with its center substantially at the level of the lower end of said gap. 7

3. I aw crusher of the type having two rocking crusher jaws each having an upper end and a lower end, said crusher comprising a support frame supporting said jaws for rocking movement relative to each other, said jaws being pivotally suspended in pivot bearings at the upper ends thereof from said support frame, a crusher drive shaft having a mid-portion extending through the lower end of one of said crusher jaws, tie rod means extending between the lower ends of said crusher jaws for operatively connecting said one said crusher jaw with the other said crusher jaw, a transverse member connecting together said tie rod means and the other said crusher jaw, said crusher drive shaft having eccentric offset means asso ciated with said tie rod means to impart rocking movements to the other said crusher jaw and having a concentric outer driven portion, said crusher jaws defining a gap therebetween and said shaft being disposed with its center substantially at the level of the lower end of said gap, a draw bar extending between said other crusher jaw and said transverse member and interchangeable shims adapted to be disposed on said draw bar for insertion between saidtransverse member and said other crusher jaw to vary the width of said gap, and a breakage guard plate disposedin engagement with said other crusher jaw and an intermediate plate between said shims and said guard plate. 7

4. Jaw crusher of the type having two rocking crusher jaws each having an upperend and a lower end, said crusher comprising a support'frame supporting said jaws for rocking movement relative to each other, said jaws being pivotally suspended in pivot bearings at the upper ends thereof from said support frame, a crusher drive shaft having a mid-portion extending through the lower end of onejof said crusher jaws, tie rod means extending between the lower ends of said crusher jaws for operatively connecting said one said crusher jaw with the other said crusher jaw, a' transverse member connecting together said tie rod means and the other said crusher jaw, said crusher drive shaft having eccentric offset means associated with said tie rods means to impart rocking movements to the other said crusher jaw and having a concentric outer driven portion, said crusher jaws defining a gap therebetween and said shaft being disposed with its center substantially at the level of the lower end of said gap, a draw bar extending between said other crusher jaw and said transverse member and interchangeable shims adapted to be disposed on saiddraw bar for insertion between said transverse member and said other crusher jawto vary the width of said gap, a breakage guard plate disposed in engagement with said other crusher jaw and an intermediate plate between said shims and said guard plate, and a suspension means supporting said shims, said draw bar and componentsassociated with said other crusher jaw on said support frame.

5. law crusher of the type having two rocking crusher jaws eachhaving an upper endand a lower end, said crusher comprising a support frame supporting. said jaws for rocking movement relative to each other, said jaws being pivotally suspended in pivot bearings at the upper ends thereof from said support frame, a crusher drive shaft having a mid-portion extending through the lower end of one of said crusher jaws, tie rod means extending between the lower ends of said crusher jaws for operatively connecting said one said crusher jaw with the other said crusher jaw, a transverse member connecting together said tie rod means and the other said crusher jaw, said crusher drive shaft having eccentric offset means associated with said tie rod means to impart rocking movements to the other said crusher jaw, and having a concentric outer driven portion, said transverse member being an axle eccentrically mounted in said other crusher jaw and adjustable means being provided permitting the setting of said eccentric axle in different fixed positions relative to said other crusher jaw to adjust the gap width between said crusher jaws, said adjustable means comprising a disk having a toothed periphery and a latch member adapted to engage the teeth.

6. Jaw crusher of the type having two rocking crusher jaws each having an upper end and a lower end, said crusher comprising a support frame supporting said jaws for rocking movement relative to each other, said jaws being pivotally suspended in pivot bearings at the upper ends thereof from said support frame, a crusher drive shaft having a mid-portion extending through the lower end of one of said crusher jaws, tie rod means extending between the lower ends of said crusher jaws for operatively connecting said one said crusher jaw with the other said crusher jaw, a transverse member connecting together said tie rod means and the other said crusher jaw, said crusher drive shaft having eccentric offset means associated with said tie rod means to impart rocking movements to the other said crusher jaw and having a concentric outer driven portion, said crusher jaws defining a gap therebetween and said shaft being disposed with its center substantially at the level of the lower end of said gap, said pivot bearings being associated with shims and abutments to permit relative positioning, and said crusher shaft being associated with drive means having a pulling portion extending generally through the area of the projected pivot axis of said one crusher jaw.

References Cited by the Examiner UNITED STATES PATENTS 1,491,430 4/24 Stebbins 241-266 2,326,215 8/43 Gruender 24l261 XR 2,591,639 4/52 Traylor 241-261 XR J. SPENCER OVERHOLSER, Primary Examiner." 

1. JAW CRUSHER OF THE TYPE HAVING TWO ROCKING CRUSHER JAWS EACH HAVING AN UPPER END AND A LOWER END, SAID CRUSHER COMPRISING A SUPPORT FRAME SUPPORTING SAID JAWS FOR ROCKING MOVEMENT RELAIVE TO EACH OTHER, SAID JAWS BEING PIVOTALLY SUSPENDED IN PIVOT BEARINGS AT THE UPPER ENDS THEREOF FROM SAID SUPPORT FRAME, A CRUSHER DRIVE SHAFT HAVING A MID-PORTION EXTENDING THROUGH THE LOWER END OF ONE OF SAID CRUSHER JAWS, TIE ROD MEANS EXTENDING BETWEEN THE LOWER ENDS OF SAID CRUSHER JAWS FOR OPERATIVELY CONNECTING SAID ONE SAID CRUSHER JAW WITH THE OTHER SAID CRUSHER JAW, A TRANSVERSE MEMBER CONNECTING TOGETHER SAID TIE ROD MEANS AND THE OTHER SAID CRUSHER JAWS, SAID 